Every business needs promotional material at some point and these marketing tools need to match the brand image and brand voice.
People are drawn to posters by their curiosity and when a design stands out it helps them to retain the information that you want to present. Posters are useful for getting the public to know your brand, products, services, or events.
Brochures are great at not just raising awareness but also providing a little more information to a potential customer. It provides more space for details than a poster and a well designed brochure could influence a purchasing decision.
Sales, coupons, discounts all need associated graphics to promote them effectively. Having a design that aligns with the brand is a huge plus since it allows for easy association.